U354FHydrogen Tank C Temperature Sensor 2 Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U354F is set when the circuit of the second temperature sensor in tank C fails. During refuelling the car hands tank data to the station; Toyota describes infrared links between the tank temperature sensors, nozzle and dispenser that set the flow so the gas does not overheat. In a published test series the fill was stopped as soon as either of two tank sensors showed 85 °C, which explains why a missing channel matters: the controller has to fill more cautiously or quit early. FMVSS 308 likewise ties a slower pressure ramp to gas above 85 °C. No maker documents U354F. Expect a hydrogen system warning and refuelling that takes longer or ends short of full, which in turn trims range. The paired sensor is U354E.
- What you may notice
- Refuelling takes longer or stops before full
- Hydrogen system warning
- Reduced range after refuelling
- Likely causes
- LikelyOpen or short in the wiring of sensor 2 at tank C
- PossibleTemperature sensor 2 of tank C failed
- RareEvaluation software needing a manufacturer update
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.